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Heavy Duty Equipment Technician Red Seal Exam Prep · Question

A technician is reassembling a planetary gear set. During the process, they confuse the sun gear with a planet gear. What immediate effect would this have if the assembly were installed into a transmission?

Sun gears and planet gears have different tooth counts, diameters, and mounting provisions within a planetary set. Incorrectly interchanging them would lead to

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Question: A technician is reassembling a planetary gear set. During the process, they confuse the sun gear with a planet gear. What immediate effect would this have if the assembly were installed into a transmission?

Answer options: ✅ The gear set would bind and seize upon initial rotation

  • The transmission would operate with significantly reduced efficiency
  • The gear set would make excessive noise but function
  • The transmission fluid would overheat rapidly

Correct answer: The gear set would bind and seize upon initial rotation

Explanation: Sun gears and planet gears have different tooth counts, diameters, and mounting provisions within a planetary set. Incorrectly interchanging them would lead to incompatible meshing, causing immediate binding and seizing once torque is applied.

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